Virtual Private LAN Services
7210 SAS M Services Guide Page 259
Table Management
The following sections describe VPLS features related to management of the Forwarding
Information Base (FIB).
FIB Size
The following MAC table management features are required for each instance of a SAP or spoke
SDP within a particular VPLS service instance:
• MAC FIB size limits — Allows users to specify the maximum number of MAC FIB
entries that are learned locally for a SAP or remotely for a spoke SDP. If the configured
limit is reached, then no new addresses will be learned from the SAP or spoke SDP until
at least one FIB entry is aged out or cleared.
→ When the limit is reached on a SAP or spoke SDP, packets with unknown source
MAC addresses are still forwarded (this default behavior can be changed by
configuration). By default, if the destination MAC address is known, it is forwarded
based on the FIB, and if the destination MAC address is unknown, it will be flooded.
Alternatively, if discard unknown is enabled at the VPLS service level, unknown
destination MAC addresses are discarded.
→ The log event SAP MAC limit reached is generated when the limit is reached. When
the condition is cleared, the log event SAP MAC Limit Reached Condition Cleared is
generated.
→ Disable learning at the VPLS service level allows users to disable the dynamic
learning function on the service. Disable Learning is supported at the SAP and spoke
SDP level as well.
→ Disable aging allows users to turn off aging for learned MAC addresses. It is
supported at the VPLS service level, SAP level and spoke SDP level
FIB Size Alarms
The size of the VPLS FIB can be configured with a low watermark and a high watermark,
expressed as a percentage of the total FIB size limit. If the actual FIB size grows above the
configured high watermark percentage, an alarm is generated. If the FIB size falls below the
configured low watermark percentage, the alarm is cleared by the system.
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